Raúl Zarca Lago defended his doctorate thesis “Design and optimization of propylene purification processes using high performance PVDF-HFP/BMImBF4/AgBF4 membranes”, developed in the Chemical & Biomolecular Engineering Department of the University of Cantabria with the supervision of Prof. Inmaculada Ortiz and Dr. Alfredo Ortiz. The event took place on November 29th, 2018. The evaluation committee was formed by Juan Ramón González Velasco (University of Basque Country (UPV/EHU), Ana María Urtiaga (University of Cantabria) and Edwin Zondervan (Bremen University).